setting ext-app for just one subdir of a vhost?

I have a special case where I'd like to set another ext-app (which is just another php-version in my case) for a given subdirectory of my domain.

e.g. I have the php4 external-app for the vhost myvhost.de bound to .php but
I want to have the php5 external-app for all .php-pages below myvhost.de/admin/ used. I can't use a different file-extension there as that app needs a hell lot of changes to use that.

The comma should be removed, maybe a bug in 2.2.6's web admin requires that.
You can fix the configuration file manually.
I tried this method with 3.0.1, it works.
Another solution is to use a rewrite rule to force MIME type of .php file to application/x-httpd-php5, you can give it a try as well.

MIME type "application/x-httpd-php5" will be added when a script handler for ".php5" has been defined, so it does not have direct relationship with an external app.

When you override the MIME type of any file extension to "application/x-httpd-php5", that file extension will be processed with the same "Handler" defined in "php5" script handler. Hope this will help.